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Finding the Fourth Proportional to 13,771.80, 20,700.90 and 13,512.60

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Solution

The fourth proportional to 13,771.80, 20,700.90 and 13,512.60 is: 20,311.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,771.80 : 20,700.90 = 13,512.60 : x
  2. Step 2: Convert to fraction form
    13,771.80/20,700.90 = 13,512.60/x
  3. Step 3: Cross multiply
    13,771.80x = 20,700.90 × 13,512.60
  4. Step 4: Simplify right side
    13,771.80x = 279,722,981.34
  5. Step 5: Solve for x
    x = 279,722,981.34/13,771.80
  6. Step 6: Final answer
    x = 20,311.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.